We all overreact sometimes. They are quite used to that and usually hold no grudge long time. You know, many people say that you should not take the <deleted>, but sometimes it´s better to just go with it. My advise for you, next time you need something. Like only the extension for one year. It´s 1900 baht. I always leave them 2k, and tell them to buy some donuts, like the US cops like. Just try it. I think they will understand, lighten up and give you a smile.